| 摘要 |
PROBLEM TO BE SOLVED: To easily execute attributes change processing for an object to be a display object, such as shadow processing with a simple algorithm by closing a cutting section where modifier volume is cut by clipping. SOLUTION: A CPU 10 reads operation information, operates modifier polygon data forming modifier volume for performing the normal polygon data and shadow processing of a three-dimensional world coordinates system and further operates a viewpoint position and its direction. A geometry supplying part 18 to which operated polygon data are supplied performs near clipping processing in accordance with a camera viewpoint, and because the modifier volume is clipped when a viewpoint position exists inside the modifier volume, it performs closed space processing that covers its cutting section (near clip surface) and performs transparent transformation of polygon data. A virtual cover is made over the cutting section of the modifier volume by the processing. |
